onCreate()中设置屏幕常亮

@Overrideprotected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    // 保持屏幕常亮    getWindow().setFlags(            WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,            WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON    );    setContentView(R.layout.activity);}